US2501227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter
Assignee: PENINSULAR METAL PRODUCTS Corp
•
Filing: 1944-10-24
•
Granted: 1950-03-21
•
Expires: 1964-10-24
Abstract
No abstract record available.
Inventors
- 👤 Paul M Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:46
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR502335A
Cited
GB317059A
Cited
US1838327A
Cited
US1878955A
Cited
US1849766A
Cited
US1892036A
Cited
US2082376A
Cited
US2186992A
Cited
US2321572A
Cited
US2375592A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-20 | 1953-09-19 | 1954-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-20 | 1957-09-19 | 1958-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-20 | 1961-09-19 | 1962-03-21 | $7700.00 | Window Closed / Lapsed |